Authors: H-D Jang, H. Chang, J-H Park, T-O Kim, K. Okuyama
Affilation: Korea Instittute of geoscience and Mineral Resources, Korea
Pages: 676 - 679
Keywords: macro-meso porous silica, nanostructures, aerosol templating, catalytic supporter
Silica nano-materials with meso- and macroporosity are of great interest due to their variety of potential applications. For the application as a catalytic supporter, nanostructured spherical silica particles having both mesopores and macropores were prepared by using an aerosol templating method with colloidal mixtures of polystryrene latex (PSL) particles and silica nanoparticles. The as-prepared particles showed bimodal size distribution consisting of mesopores ranged 2 to 20 nm and macropores ranged 60 to 160 nm. As the PSL size decreased, mesopores size increased due to a reduction in packing rates of primary SiO2 nanoparticles composing the walls of nanostructured porous particles. With an increment of the weight ratio of PSL/SiO2, mesopores size increased but mesopores volume decreased due to the broken structure of particles and the reduction in the packing rates. Mesopores disappreared when the furnace temperature was 900 oC. The residuals of organic template were detected when furnace temperature and flow rate of carrier gas were below 600 oC and above 3 l/min, respectively.